In a few locations the LOA x the Beam is used in the dock cost formula , but mostly to get bigger bucks from multihulls , not to lower the cost of a skinney boat.

The Long Beach marinas were talking about doing this, but in the end they just added a $0.92 per square foot wide slip fee. I was thinking that the LOA x beam formula would be more equitable, but then I realized that longer boats require wider channels so they can get into and out of their longer slips. So the formula should probably be 1.5 x LOA x beam, which would still favor shorter beamy boats.